Bully Dog CUMMINS X15 HP Turbo + Actuator OEM: 5609888

The Bully Dog Cummins X15 High HP Turbo + Actuator (OEM Cross-Reference: 5609888, Bully Dog SKU: 56158) is a performance-grade, direct-fit replacement for the high-output variants of the Cummins X15 engine series.

It is specifically designed for the EPA21 (2021–2024+) emissions standard engines, typically found in Class 8 heavy-duty trucks.

Vehicle & Engine Compatibility

This turbocharger is compatible with heavy-duty trucks from major manufacturers that utilize the Cummins X15 Performance Series (High HP) engine.

• Engine Series: Cummins X15 (specifically the CM2450 control system and EPA21 emissions profile).

• Horsepower Range: Factory High HP models, typically rated between 525 HP and 605 HP.

   

• Model Years: Generally 2021 to 2024+ (interchangeable with some late 2020 models).

• Common Truck Applications:

  • Peterbilt: 389, 567, 579

  • Kenworth: W900, W990, T680, T880

     

  • Freightliner: Cascadia, 122SD

     

  • International: LT Series, LoneStar, HX Series

  • Volvo/Western Star: VNL series and 49X/57X models equipped with Cummins powerplants.

     

Key Technical Specifications

Performance Benefits

Unlike a standard OEM replacement, this Bully Dog "Stage 1" version features a lighter billet compressor wheel. This results in:

• Faster Spool-up: Reduced turbo lag and better throttle response.

   

• Lower EGTs: Improved airflow helps keep exhaust gas temperatures down under heavy loads.

   

• Increased Boost: Can provide a gain of up to 7 PSI over the stock unit.

   

• Reliability: Includes an upgraded cobalt VGT cage and ring to prevent the common "sticking" issues found in factory actuators.

   

Note: This turbo is intended for "High HP" applications. If your X15 is an Efficiency Series (typically 400–500 HP), you likely need OEM part 5602145 instead, as the turbine housing and wheel sizing differ.